Writing instrument



FIG. 1 is a perspective view of the writing instument;

FIG. 2 is a front elevational view of the writing instrument;

FIG. 3 is a rear elevational view of the writing instrument;

FIG. 4 is a left elevational view of the writing instrument;

FIG. 5 is a right elevational view of the writing instrument;

FIG. 6 is a top plan view of the writing instrument; and,

FIG. 7 is a bottom plan view of the writing instrument. 

The ornamental design for a writing instrument, as shown. 